Toolholding attachment for lathes



J. A. HONEGGER TOOLHOLDING ATTACHMENT FOR LATHES June 26, 1945.

Filed March 26, 1942 A Q 1 m in MM 9 4 0 5 %4 EEEEWNMW fl M W W /.\\\MZ INVENTOR (fozz xiflrrzey en ATTORN EY Patented June 26, 1945 TOOLHOLDING ATTACHMENT FOR LATHES John A. Honegger, Bloomfield, N. J., assignor to,

Kidde Manufacturing 00., Inc., Bloomfield, N. 1., a corporation of Delaware Application March 26, 1942, Serial No. 436,297

' 3 Claims. (01. 2948) The present invention relates to lathes, and

more particularly to an attachment for mounting a plurality of tools.

The present invention aims to provide a toolholding attachment which is particularly adapted to be used in connection with metalworking lathes and the like.

The attachment is adapted to be mounted on the tailstock of a single purpose lathe to thereby convert the lathe into a multipurpose or turret lathe. The attachment is also adapted to be mounted on the tool turret of a turret lathe to increase the number of operations which may be performed by the lathe.

An object of the present invention is to provide an improved, simple and inexpensive-tool holding attachment which serves as a tool turret and increases the utility of lathes.

Another object is to provide an attachment for -mounting a group of tools which are adapted attachment adapted to withstand rough usage without getting out of adjustment or repair.

A further object consists in the combination and arrangement of the parts of the attachment,

whereby the foregoing objects may be accomplished.

Other and further objects of the invention will be obvious upon an understandin of thev illustrative embodiment about to be described, or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice. A preferred embodiment of the invention has been chosen for purposes of illustration and description and is shown in the accompanying drawing, forming a part of the specification,

wherein:

Figure 1 is a top plan view of the tailstock of a lathe having an attachment, illustrating an embodiment of the invention, mounted thereon.

Figure 2 is an enlarged sectional view taken substantially along the line 22 on Figure 1.

Figure'3 is an enlarged bottom plan view, with certain parts of the attachment broken away for clearness.

Referring to the drawing, and more particularly to Figure 1 thereof, there 'is shown a toolholding attachment III, in accordance with the invention, mounted on the tailstock H of a lathe. While the attachment is shown as used in connection with a tailstock, for illustrative purpose, it willbe'understood that the attachment may also be mounted at one, of the tool stations in a tool turret of a turret type lathe, as will be described hereinafter.

The attachment, as shown in Figures 2 and 3,

comprises a body member l2 having a lower clamping flange or cradle plate it; an upper clamping flange or plate l5, parallel to and spaced from the lower flange M; and a circular disc- 'like turret member l6 rotatably mounted in the space between the flanges.

. The body member l2 has a vertical wall portion H at one end thereof which is provided with an arcuate, inwardly facing surface IQ for receiving the rotatable turret member IS. The wall portion I1 is further provided with an aperture 20 for receiving one end of a tapered shank 2! adapted to fit into the tool clamp of a tailstock or a tool turret. The shank 2| preferably is secured to the body member by'a cross pin 22, or

the like, which enables the shank to be readily detached and replaced by shanks having other diameters or tapers, whereby the attachment can be used in connection with lathes varying in size over a wide range.

' The lower flange M of the body member is adapted to support the lower face of the turret member l6 and is provided with an aperture M adapted to receive a bolt 25, or the like, for rotatably mounting the turret member. The lower flange also carries an indexing device 26 (Figure 3) which will be described in detail hereinafter.

The upper flange or plate l5 may be substantially triangular in shape (Figure 1) and is attached 'to the body member l2 by a pair of machine screws 21 or the like, extending through apertures 29 in the plate l5 and threaded into the upper end-of the wall portion l1. At the apex of the plate IS, an aperture 30 is provided for receiving'the bolt 25. Preferably, the upper plate IE or the upper end of the wall portion I1 is provided with a pair of thrust pins 3| and, respectiveIy the upper end of the wall portion or the plate is provided with apertures 32 for receiving the pins 3|. These pins when inserted into their apertures serve to maintain the aperture 3B of the upper plate in alignment with the aperture 24 of the lower plate, and prevent sidewise shifting of the plate when the screws 21 are slightly unscrewed to facilitate the clamping action of the plates l4 and IS.

The turret member 16 preferably is in the form of a circular disc of suitable thickness to be provided with a plurality or series of circumferentially spaced radially extending apertures 34 for receiving the shanks of a group of tools A, B, C

and D (Figure l). The shanks of the tools are adapted to be secured in the apertures 34 by set screws 35, or the like, threaded into apertures 36 extending downwardly from the upper face of the turret member. When the screws are in tool securing position, they are fully confined in the apertures and do not extend above the upper face, whereby the screws will not interfere with the rotation of the turret member. between the upper and lower plates.

The turret member 85 is provided with a centrally located aperture 31 for the bolt; 25 which extends through the upper and lower plates and serves to rotatably mount the turret member. The head end .of the bolt carries a lock washer 38 which engages the underside of the lower flange to prevent rotation of the bolt 25 and the free end of the bolt projects upwardly out of the upper flange lb. The free end of the bolt has threads 39 for screwing on the threaded hub Ml of a clamping lever M. adapted to bear against the top side of the upper flange to urge the flanges Id and i5 into clamping relation with the turret member it and thereby prevent rotative movement of the turret member.

The indexing device 28 is illustrated more particularly in Figures 2 and 3. This device comprises a pin 52 extending through a vertical aperture in the lower flange or cradle plate is. The center of the aperture is in a. vertical plane extending through the longitudinal axis of the shank 2i and is diametrically opposite the point at which the tools are placed into working position. In order to selectively place each of the tools into working position, recesses or apertures 45 are provided in the lower face of the turret member, each recess being diametrically opposite the tool it indexes and being spaced from the center of the turret member the same distance as thepin 42 so that the pin is adapted to extend therein to effect indexing.

The pin 42 preferably is slidablydisposed in a boss #16 which is laterally slotted at 61 for receiving a'lev'er or arm 69 for sliding the pin into and out of index recess engaging position. The lever 49 is disposed in a slot Ellat the lower end of the pin and is pivotally connected thereto by a crosspin 5! passing through the slotted end of the pin and through an aperture 52 in the lever.

One end of the lever 69 is pivotally mounted at the underside of the lower flange by a shaft or rod 54 supported on bearing members 55. A spring 56, or other suitable resilient means, adjacent the bearing members, serves to urge the lever upwardly toward the underside of the lower flange and thereby urge the index pin 42 into inferent'operations on the work piece in selected sequence. For example, .A may be a center drill, B may be a boring or drilling tool, 0 may be a spot-facing tool, and D may be a tapping or threading tool. The tools may be placed successively'lnto work engaging position in the selected sequence, by loosening the clamping lever 4| and pressing the free end of the index pin operating lever downwardly to move the pin 42 out of indexing position. The turret member may then be rotated into its desired position and secured in place by screwing down the clamping lever. In the foregoing manner a single purpose lathe is converted into a lathe adapted to perform a sequenceof operations.

The attachment may also be used in connection with a turret lathe having a tool turret which usuallyis provided with six stations or tool supporting clamps. Such lathe is limited to perform sixoperations, but this number can be increased to nine or more by securing one or more attachments, in accordance with the invention, in

the tool clamps of the turret. By using the pres-' I cut attachment, complex articles can be made entirely on one machine and the series of operations can be performed without interruption.

From the foregoing description it will be seen tion and may be economically manufactured.

The attachment is rugged in construction and can readily withstand-any rough usage to which it may be subjected.

While my invention resides in certain principles of construction and operation, which have been illustrated and described in connection with the accompanying drawing, it will be apparent to those skilled in the art that the invention may be embodied in other forms of construction without departing in any manner from the spirit and scope of the invention, and I therefore do not wish to be strictly limited to the disclosure, but rathed to the scope of the appended claims.

I claim:

1. A lathe attachment comprising a'body member having a clamping flange and having a wall portion provided with an arcuate surface; a clamping flange mounted on said wall portion; means for removably securing said second clamping flange on said wall portion; .a disc-shaped .turret member intermediate said flanges having an arcuate peripheral surface disposed adjacent the arcuate surface of said wall portion, tool retaining means at its periphery substantially diametrically opposite its arcuate surface, and having-a lower face seated on the flange of said body member and provided with a series of index recesses; a pin extending through the flange of said body member adapted to project into said recesses; means mounted on said body member for retracting said pin; said flanges and said turret member eachhaving an aperture therein; a bolt member extending through said apertures; clamping means on said bolt member for causin said flanges to clamp said turret member to prevent rotation thereof; and a shank removably secured to the wall portion of said body member.

2. A lathe attachment comprising a body member having an integral clamping flange and a well portion provided with anarcuate surface; a second clamping flange mounted on said wall portion; means for removably clamping said second flange to said wall portion; a disc shaped turret member intermediate said flanges having an arcuate peripheral surface disposed" adjacent the arcuate surface ofsaid wall portion; said turret member having a series of circumferentially spaced radially-extending apertures for receiving shanks of a series of tools and having a series of index'recesses substantially diametrically opposite said apertures; screw members associated with each of said apertures and below the upper surface of said turret member for securing the said tool shanks in said apertures; said clamping flange of the body member having an aperture extending therethrough; a pin normally entirely within saidaperture and adapted to engage the recesses in said turret member; and a lever pivotaiiy mounted on said body member and pivotaily secured to said pin for retracting said pin from said recess.

3. A lathe attachment comprising a body membe: having an integral clampingflange and a wall portion provided with an arcuate surface; a second clamping flange mounted on said wall portion; means for reinovably clamping said second flange to said wall portion; a disc shaped turret member intermediate said flanges having an arcuate peripheral surface disposed adjacent the said tool shanks in said apertures; said clamping flange of the body member having an aperture extending therethrough; a pin normally entirely within said aperture and adaped to engage the recesses in said turret member; a lever-pivota1ly mounted on said body member and pivotally secured to said pin for retracting said pin from said recess; a bolt extending through said turret membergand said flanges having a. head at one end engaging one of said flanges and being screw threaded at its other end; and a clamping member on the screw threaded end of said bolt for causin said flanges to clamp said turret member to prevent rotation thereof. A

- p JOHN A. HONEGGER. 

